Same here, the various ones I have asked at our over the last few years have all pretty much turned me down, mostly to my ability to pick out women who're already in relationships. I did manage to ask one out a couple years ago, more of an open-ended "would you like to go out?" thing without any specifics, got a "yes" and I blew my wad of confidence in getting the digits and never asked her out again mostly due to still getting cold or hard-to-read reaction from her in the days afterwards when we'd chat or see one another, she got a job at another location within a couple of months of me "asking her out" and I never saw her again.